Adhesive Composition for Coating-Type Polarization Elements
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Solution Overview
Problem
Coating-type polarization elements in image display devices are prone to degradation due to ambient light, leading to a deterioration in polarization performance over time, and existing adhesives lack sufficient light resistance to prevent this issue without the need for protective film layers.
Innovation Solution
An adhesive composition comprising a (meta)acrylic polymer, an ultraviolet absorber, and a radical polymerization initiator is used to form an adhesive layer with specific light transmittance and b* value characteristics, allowing for the integration of coating-type polarization elements with other image display device constituents without protective film layers, enhancing light resistance and preventing photodegradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If coating-type polarization elements are used to achieve thinness, then the element thickness is reduced, but light resistance deteriorates and polarization performance degrades over time
Solution Approach 1:
The invention uses a composite adhesive composition containing (meta)acrylic polymer, ultraviolet absorber, and radical polymerization initiator. This composite material combines the adhesive properties of acrylic polymer with the light-protection function of ultraviolet absorber, creating a single layer that both bonds components and protects the coating-type polarization element from photodegradation.
Solution Approach 2:
The adhesive composition serves multiple functions simultaneously: it provides adhesion between the polarization element and other components, acts as a protective layer against ultraviolet and visible light, and enables curing through radical polymerization. This multi-functionality eliminates the need for separate protective film layers.
2Reliability
If protective film layers are added to improve light resistance, then polarization performance is maintained, but device complexity increases
Solution Approach 1:
The invention merges the adhesive layer and protective film layer into a single integrated layer. The adhesive composition contains both bonding agents and ultraviolet absorbers, combining the functions of adhesion and protection in one layer, thereby simplifying the overall device structure.
Solution Approach 2:
The adhesive composition is designed to perform multiple functions: providing structural adhesion, blocking ultraviolet and visible light, and enabling photopolymerization curing. This multi-functional design eliminates the need for separate protective films and reduces device complexity.
3Strength
If conventional adhesives are used to achieve good adhesion, then bonding strength is sufficient, but light resistance is insufficient and photodegradation occurs
Solution Approach 1:
The adhesive composition is a composite material combining (meta)acrylic polymer for adhesion, ultraviolet absorber for light protection, and radical polymerization initiator for curing. This composite structure maintains strong bonding while adding photoprotection capabilities.
Solution Approach 2:
The ultraviolet absorber acts as an intermediary substance within the adhesive layer that absorbs harmful ultraviolet and visible light before it can reach and degrade the coating-type polarization element, while not interfering with the adhesive's bonding function.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The adhesive composition effectively prevents polarization performance degradation and supports the thinning and weight reduction of image display devices by providing excellent light resistance and integration capabilities, ensuring improved durability and performance.
Implementation Method 1
an adhesive composition comprising a (meta)acrylic polymer (A), an ultraviolet absorber (B), and a radical polymerization initiator (C)
Implementation Method 2
adhesive sheets containing an ultraviolet absorber are known to be used between a surface protection panel and an image display module to suppress photodegradation of image display device constituting members
Data Source
AI summary
Provided is an adhesive composition for coating-type polarization elements containing a (meta)acrylic polymer (A), an ultraviolet absorber (B), and a radical polymerization initiator (C), wherein an adhesive layer formed from the adhesive composition has a transmittance at a wavelength of 400 nm of 50% or less, and the adhesive composition can be used in combination with a coating-type polarization element to prevent the coating-type polarization element from deteriorating polarization performance over time due to exposure.